http://d.puremagic.com/issues/show_bug.cgi?id=8821
Summary: countUntil chokes on reference ranges
Product: D
Version: unspecified
Platform: All
OS/Version: All
Status: NEW
Severity: normal
Priority: P2
Component: Phobos
AssignedTo: [email protected]
ReportedBy: [email protected]
--- Comment #0 from [email protected] 2012-10-14 13:43:47 PDT ---
Example:
//---
import std.algorithm;
import std.stdio;
import std.array;
struct Forward
{
static struct P
{
string s;
}
P* _p;
this(string si)
{
_p = new P();
_p.s = si;
}
@property dchar front()
{
return _p.s.front;
}
void popFront()
{
_p.s.popFront();
}
bool empty()
{
return _p.s.empty;
}
}
void main()
{
auto s = Forward("abc");
auto s1 = Forward("ac");
s.countUntil(s1).writeln();
}
//---
Produces "1".
ROOT CAUSE ANALYSIS: The "problem" is "startsWith", which will consume both its
input (both haystack and needle). Here, the first call to start with will
consume the "a" of both "abc" and "ac". countUntil will the pop the b off of
"bc", and finally, call startsWith on "c" and "c".
Recommend saving ranges before calling startsWith (if both are ranges), but a
more efficient solution could be found.
Assigning to self.
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